Observation of Two Charged Bottomoniumlike Resonances in Υ ( 5S ) Decays

• Published in: Physical review letters 2012-03, Vol.108 (12)
• Main Authors: Bondar, A., Garmash, A., Santel, D., Adachi, I., Aihara, H., Asner, D. M., Bakich, A. M., Barberio, E., Belous, K., Bhardwaj, V., Browder, T. E., Chang, M. -C., Chang, P., Chen, A., Cheon, B. G., Cho, K., Choi, S. -K., Dalseno, J., Danilov, M., Doležal, Z., Drutskoy, A., Gaur, V., Goh, Y. M., Haba, J., Inami, K., Ishikawa, A., Iwabuchi, M., Iwasaki, Y., Iwashita, T., Julius, T., Kawasaki, T., Kiesling, C., Kim, J. B., Kim, J. H., Kim, K. T., Kim, Y. J., Ko, B. R., Kobayashi, N., Koblitz, S., Kodyš, P., Korpar, S., Križan, P., Kumar, R., Kumita, T., Kuzmin, A., Lange, J. S., Li, J., Libby, J., Liventsev, D., Louvot, R., Miyata, H., Miyazaki, Y., Mohanty, G. B., Moll, A., Muramatsu, N., Mussa, R., Natkaniec, Z., Niiyama, M., Nishida, S., Nitoh, O., Nozaki, T., Pakhlov, P., Park, H., Park, H. K., Pedlar, T. K., Petrič, M., Piilonen, L. E., Sahoo, H., Sakai, Y., Sanuki, T., Schneider, O., Schwanda, C., Senyo, K., Sevior, M. E., Shapkin, M., Shibata, T. -A., Shiu, J. -G., Simon, F., Sokolov, A., Sumihama, M., Sumiyoshi, T., Tatishvili, G., Teramoto, Y., Tikhomirov, I., Uchida, M., Ushiroda, Y., Vahsen, S. E., Varner, G., Wang, C. H., Wang, X. L., Williams, K. M., Won, E., Yabsley, B. D., Yamashita, Y., Yamauchi, M., Yuan, C. Z., Zhang, Z. P., Zhilich, V., Zupanc, A., Zyukova, O.
• Format: Article
• Language: English
• Subjects: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.108.122001

We report the observation of two narrow structures in the mass spectra of the π±Υ(nS) (n=1, 2, 3) and π±hb(mP) (m=1, 2) pairs that are produced in association with a single charged pion in Υ(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M1=(10 607.2±2.0) MeV/c2, Γ1=(18.4±2.4) MeV, and M2=(10 652.2±1.5) MeV/c2, Γ2=(11.5±2.2) MeV. The results are obtained with a 121.4 fb-1 data sample collected with the Belle detector in the vicinity of the Υ(5S) resonance at the KEKB asymmetric-energy e+e- collider.